Propeller



Nov. 29, 1927.

E. E, SCHUMAKER PROPELLER Filed Dec. 5. 1926 NVENTOR V 3. 621077606 7 ATTORNEYS Patented Nov. 29, 1927.

EDWARD E. SCHUMAKEB, OF HIIIIB EBT, WISCONSIN.

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Application filed December 8, 1926. Serial No. 152,409.

, This invention relates to propellers and has for an object to provide an improved construction of propeller for rapidly moving vehicles, as for instance, aeroplanes, the object being to provide a structure whereby a maximum propulsion is secured for a s1ngle propeller.

Another object of the invention 1s to provide a propeller wherein the pressure of the air against a surface is utilized for propelling purposes. A further object, more specifically, 1s to provide a propeller having a flange or diskshaped section at right angles to the threetion of travel, with blades parallel to the 7 direction of travel posltioned to force" the I mately two-thirds as air radially in order to cause a difl'erent air pressure on opposite sides of the propeller and thereby produce a forward urglng or propelling action.

In the accompanying drawing Fi re 1 is a longitudinal vertical sectiona view through Figure 2 on line 1 -1, the upperportion being shown in elevation.

Figure 2 is a front view of a propeller disclosing an embodiment of the invention.

Referrin to the accompanying drawing by nuinera s, 1 indicates a driving shaft connected to the engine of an aero lane or other vehicle and driven at any esired speed. Secured to the shaft 1 is the hub 2 of the ropeller, said hub merging into what may termed an abutment or flange 3 arranged in a lane at right angles to the axis of shaft 1, w ich shaft extends inthe direction of travel. The flange or abutment 3 is positioned next adjacent the aeroplane while the end 4 faces in the direction of travel.

hub 2 is preferabl provided wit'h'a number of slots-5, said sl ots-merging into similar slots in the flange3 whereby different blades 6 may be. fitted into these slots and then welded or otherwise rigidly secured in place.

The blade 6 at height as the flange front so that the forward end 7 is approxiblade in the flan e 3. in forming the pro peller, substantia 6 may be arrange 11 any given but preferably approximately blades are-use ropeller,

" 3- thirty-six inches in diameter. As the'varis ous blades 6 extendin a straight line from the front to the rear and extend radially,

- the propeller may operated'in either usual in an aeroplane propeller,

will press against the air on one side and consequently,

The

one end is of the same- 3 but taperstoward themately' the same as hi h as the end of the rywiany number of blades I t irt -twoin a propeller-having a ange at the o posite end rection and will produce a forward urge to As the propeller is rotated rapidly, as is the blades will force the air radially outwardly and by this action produce a vacuum 'on the opposite.

face, said vacuum being more nearly a complete vacuum near the flange 3. If a complete vacuum was formed and the. air pressure in which the propeller was located was ten pounds to the square inch, there would be a ten pound pressure against flan e 3 forcing the same forwardly. By multlply ing the number of square inches in the rear face of flange 3 by ten, the entire forward pull will be found, which gives agreater efficiency than where pressure of the blades against the air of the ordina propeller is ally rotating, the ower of e engine is utilized'in forcing t e air radially outwardly and thereby utilized in which in turn permits the pressure of the airof the atmosphere to urge the ropeller of the aeroplane forwardly. It wil thus be seen that a maximum power of the enginehis at forward movement of the aeroplane. When the propeller is rotated at a greater speed than necessary, little, if any, loss occurs, as a maximum vacuum is then secured and, a maximum pressure on the flan e is attained while the speed of the bla es is such that there is a reduced'pressure of the air thereon.

What I claim is:

A pro eller comprising a hub formed with a plurality ,extendin the. full length of t sitioned slots e-hub a flange connecte with the hub at one end thereof and extendin at right angles to the axis of the hub, sai flange havm' radially positioned slots mer'gin' into 518.51.435 11! said hub, said flange n iameter being approxi:

of longitudinally forming the vacuum' thelength of said hub,

'the shaft 1 and parts associated therewith.

and a luralityof radiating bladescarried spective slots in the hu into the respective slots in said flan of said blades extending to the peri said flange at the flange end of the h extending for a less disby the ub with one edge fitted into the reery of tance ra any.

. EDWARD E. some;

and one end fitted each uband 75 T depended upon. As the proppl er is continu- 

